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Zhang Y.,Shenyang Jianzhu University | Shan C.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Xiong W.,China Communications Construction Company Ltd. | And 2 more authors.
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2013

The climate has a great impact on highway bridge rubber bearings than on building rubber bearings. In order to study the change of the mechanical properties during the life of the plain chloroprene rubber bearings of highway bridge under freeze-thaw cycle condition, the plain chloroprene rubber bearings were processed 25, 50, 75, 100 times by freeze-thaw cycle in the standard freeze-thaw chamber, then the axial compression tests were carried. The changes of the performance indicators in the bearing capacity, the ultimate compressive strength, vertical stiffness, elastic modulus under different freeze-thaw cycles were analyzed comparatively. The results show that the plain chloroprene rubber bearings are more prone to brittle failure after the freeze-thaw cycle, and the failure phenomena of steel plate exposing or cracks is more serious than the phenomena of the standard specimen. With the increase of the number of freeze-thaw cycle, the ultimate bearing capacity, ultimate compressive strength and compressive elastic modulus of the plain chloroprene rubber bearings decrease. The attenuation formula and decay curve in 50 years of ultimate compressive strength and elastic modulus of compression are analyzed by least square method, the trends of change are both in line with the exponential function. The mechanical properties of plain chloroprene rubber bearings of highway bridge significantly decreased under freeze-thaw cycle condition. therefore, the temperature ranges of plain chloroprene rubber bearings of highway bridge should be strictly controlled, and some suggestions, such as increasing its minimum applicable temperature, using the natural rubber bearings as much as possible in cold regions, have been given. Source


Zhang Y.-N.,Shenyang Jianzhu University | Shan C.-H.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Shen X.-J.,Chongqing Highway Engineering Quality Inspection Center | And 2 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2013

The impact of climate is more serious to highway bridge rubber bearings than building rubber bearings. In order to study the change on the shear properties of plain chloroprene rubber bearings of a highway bridge affected by climate change, the changes of low-temperature climate are simulated by using a standard freeze-thaw chamber. The plain chloroprene rubber bearings are processed 25, 50, 75, 100 times, then the shear tests are carried. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness, and elastic modulus of shear of plain chloroprene rubber bearings of a highway bridge under a freeze-thaw cycle condition are studied through the contrastive analysis. The results show that the plain chloroprene rubber bearings are more to failure under a freeze-thaw cycle than the standard sample. The exposure of a steel plate and cracks destructive phenomenon are more serious. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness, and elastic modulus of shear of plain chloroprene rubber bearings decreased with freezing and thawing increasing. The decay curve and attenuation formula in 50 years of ultimate shear strength and the elastic shear modulus of plain chloroprene rubber bearings are developed by the least square method, and decay trends of ultimate shear strength and elastic shear modulus are approximately according with power function. Source


Zhang Y.-N.,Shenyang Jianzhu University | Shan C.-H.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Shen X.-J.,Chongqing Highway Engineering Quality Inspection Center | And 2 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2012

The impact of climate is more serious to highway bridge rubber bearings than to building rubber bearings. In order to investigate the changes of the mechanical properties of plain chloroprene rubber bearings of highway bridge in high temperature of summer, the plain chloroprene rubber bearings were processed in 20, 40, 60, 80 days by high-temperature chamber, and then the axial compression tests were carried by pressure testing machine. The impact of thermal aging in carrying capacity, ultimate compressive strength, vertical stiffness, and elastic modulus of compression was analyzed. The results showed that, under thermal aging, the plain chloroprene rubber bearings was easier to brittle failure, the elastic stage was shorten, and the phenomenon which plate exposure, cracks and layered damage was more serious. With deepening of degree in thermal aging, the carrying capacities, ultimate compressive strength, vertical stiffness, and elastic modulus of compression were decreased. The dates of compressive strength and elastic modulus of compression in 50 years were analyzed using the least square method, and the results showed that the decay function and decay curve were basically in line with variation of power function. Source

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